Rod or stem packing



F. H. PIKE ROD QR STEM PACKING Feb. 5, 1929.

Filed Nov. s, 1926 "Patented Feb. 5, 1929.

- QUITE sIATEs FREDERICK 1I. PIKE, OE CHARLESTON, SOUTH CAROLINA, ASSIGNOR,BrY MEsNE 'l {1,7oa74611 i j] 'SIGNMEN'rs To 'IIIEv GENERAL AsBEsrOsAND RUPRERR COMPANY, OECHARLES..

TON, SOUTH CAROLINA, A CORPORATION OE SOUTH CAROLINA.

ROD OR'STEM Ina'oniacr.'`

l Apncationmed November 5, 19.26. yserial No.' 146,379. 1 l

This invention relates to *al packing which is used ,for packing reciprocating and'rotatingrrods, such as piston or pumpirods for packing againstV steam and 'other active 5 agents, and has forV an object to form animprovedpacking which will be more flexiblev than the packing now generally constructed so that it may be kwrapped about rods of relatively Small diameter without breaking or in- VV juring'the packing and stillwill retain its' shape in use.

'It is also an object of the invention to Vpro- 'Y vide a packing ofthis'type which will h ave f l the property of expanding in one direction by compression in a direction at right angles to thisffr'st direction.

It is another object of the invention to providea packing in which 'a' lubricant of various elements forthe packing is sealed Within vthe packing,`and therefore, the desired flexi 4bility or yielding properly will be maintained indefinitely without 'theipacking becoinlng hard. f f l With the foregoing ,and other objects in view, I have devised lthe new construction of packing, some ofthe preferred forms ,of

which `are'illustrated in the accompanying drawing forminga part of this specification. In this drawing, l Y

Fig. 1A is a perspective view of a piece of packing constructed according to my invention but withV portions of the jackets or casings broken'away to'more' Clearly Show the 'construction Fig. 2 is a transverse section thereof.

Fig. 3 is a view similar to Fig. 1 showing a 7 slightly different way of arranging the yarns V for the Outer casing, and o l Fig. 4L is aside elevation showing a still difv casing.

This packing is preferably'rnade of asbes-y tos, although certain other substances may be incorporatedl if desired to increase` the strength thereof, as for instance, some cotton or linen, thread or fibres may be twisted or incorporatedin the yarns, especially thosev packing inde nitely.

ferent way of arranging the yarns forrthisV of asbestos yarn, and they are also preferablyarranged in parallel relation.k .Tightlyen-l` i closing this core is a lcasing or a jacket '6i 55` which iis composedof yarn, preferably ofjasbestos,vbraide`d about thefyarns'ofjthe core;H

This inner -casingor jacketis then covered with afresh coating offrubber compound or cement 7 andjan outer casing or jacket-8 isf then woven over this cernentandthe inner" casing. It is preferred that this Outer acket be woven in position on theinner jacketfor casing and thus form a seamless woven cas-V ing, vThev parallel arrangement ofthe yarns 5 gives the packing the property of expand-l ing in one direction by compression in a 'di' rection at right angles to this direction, so:y

that when tightenedor compressed `by the gland or follower in the stuffing box therpacking will expand radially against thewalls-of the rod or cylinder makingth'e'tight joint The yarns of the core arealso lluf-V bricated withv asuitable lub'ricantand graph-Y ite, so that they are easilymovableone upon l desired.

or relative to each other. 'Il-ieicoating? of the -rubber compound 'seals jtheinner casing 'i fand' core and'retains thev lubricant therein,

andftlierefore .retains 'the' flexibility ofthe ments the two casings or jackets together,and

therefore, helps to keep Athem inproper rela-l tive positions. Asbestosgis peculiarinthat it tends to pack under pressure:rather-than` flow yso. that by using the parallel vor longitudi-l 'l j' nall'y extending unwovenlubricated yarns This coating also rce-.

the center I secure the flow or yielding 11e-1"" quired inthis type .of packing,A and I ain en# y l vabled 4to use `asbestos withitsdesirable propr,k y 5 erties of Afirey and-"heat resistance and also 11e-:-

sistanceto chemical action, andA with` the. sealr Y for the lubricant can maintain` thisy vflexij bility, indefinitely withoutthe packing bef coming hard. The combination of the'braid- 1 ed and woven jackets or` casing with this arrangement'of the core gives the desired flexi'- y change to maintain the-propershape. The

longitudinally'giving a very vflexible center bility while giving Sufficient resistance to In Figs. and 4 I have shown slightly different arrangements ormethods of weaving theouterocasing or jacket, It will be apparent that where 'the packing is used on rods kof relatively small diameter, in wrapping the packing about the rodth-e outer surface must be longer than the inner'surface due to the difference inthe length of the inner and'outer f radii, and therefore, if the warp threads of the jacket extend parallel with the axis of the Vpacking an undesirable strain inay be placed on 'the warps in the outer surface. I

may, therefore,las shown in Fig. 3, arrangel thefwarps 9 of the outer jacket or casing l()V vspirally about the inner jacket so that whenY e the packing isy wrapped v about ythe.` rod the warps inthe outer surface of the packing may rstraighten lsomewhat and Abecome Vmore Y nearly parallel with the axis ofthe packing i and will not be placed under undue strain.

A similar effect may be securedas .shown `in Fig. 4, by arranging the warps l1 of the outergj acketorfcasi-ng 12 ina zigzagrelation which will allow them to straighten out asV the packing is` `wrapped about lthe rod and thus prevent any undue strain on these warps.

It will be apparent'thatthis arrangement also j l y without the 'packingbecoming hard.

invention, 'what' I claim is.:

I-Iavingfthus lset4 forth the nature of.l my

1. As a Vnew 'article' vof flexible packing comprising a'core consisting v first casing. l l K 24As a newl article of manufacture aof aplur'ality oflongitudinally extendingunwovenlibre yarns, a flexible fibre casing of braided yarns enclosing saidfirst yarns, and anouter woven fabric casing enclosing the flexible packing comprising a ircore consisting "of a plurality of longitudinally extending unwoven yarns, a flexible 'fibre jacket braided manufacture a stretching.

about said yarns, and a second nbre jacket j woven in position about the rst jacket. Y

3. As a new` article of manufacture a flexible packing comprising a core composed of a plurality of parallel 4fibre yarns, a casingyof braided bre yarns enclosingv the fi-rst yarns, a lubricant withinjtliecasing for the first yarns, a coating'of'a cement aboutthe braided casing and acting to'se'al thelubricant in 'the core, and an outer woven casing aboutsaid Coating,

4. As a new article of manufacture a flexible packing comprising a core composed l ofa plurality of longitudinally extending,un

woven fibreyarns including asbestos, a braidedfbre casing including asbestos enclosing said yarns, and an Vouter seamless woven fibre A casing including asbestos enclosing the first casing/f Y l e Y 5. As aanew article of Ai'nanufacturea fiexible packing comprising` a core composed ofl a plurality of longitudinally extending un- .Y

woven asbestos fibre arns alubricantforsai'd yarns, a braided asbestos libre casing enclosing said yarns, a seamless woven asbestos fibre casing enclosing the first casing-,and a coating of a ceinenting compound between the two casings and forming a seal to retain the lubricant in the core. Y i

,6.f As anew article of manufacture la flexif ble'packing comprising/a iiexible core coinposed of a plurality ofelenients, and a woven fibre casing enclosing said elements, the warp .yarns of the casing being inclined to the axis of the packing so that when thel packing is ybent about a curved member the warped strands in the outer portion ofthe casing may felongate without stretching.

7. As a.. new article of inanufacturea iiexi-l ble packing including a core composed ofaj plurality of longitudinally extendingvyarns,

a braided fibre casing enclosing said yarns,

and a woven fibreicasing' enclosing the lirsi casing, the warpof saidvouter casing being inclined to the axis ofthe -packingso that when the packing is bent about ay curvedinei'nbei the strandsof the warp at the outer portion ioffthe packing `may elongate Vwithout* whereof I afhx my signature. i

In testimony Y Y FREDERICK PIKE. 

